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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: Tìm x: (4-3x)^2-(3x-2).(3x+2)=0

Toán Lớp 8: Tìm x: (4-3x)^2-(3x-2).(3x+2)=0

Comments ( 2 )

  1. $y10000$
    ( 4 – 3x )² – ( 3x – 2 ) . ( 3x + 2 ) = 0
    <=> 16 – 24x + 9x² – ( 9x² – 4 ) = 0
    <=> 16 – 24x + 9x² – 9x² + 4 = 0
    <=>  20 – 24x = 0 
    <=> 4 . ( 5 – 6x ) = 0
    <=> 5 – 6x = 0 
    <=> -6x = -5
    <=> x = 5/6
     Vậy S = { 5/6}

  2. (4-3x)^2-(3x-2).(3x+2)=0
    <=>16-24x+9x^2-9x^2+4=0
    <=>16-24x+4=0
    <=>-24x= -20
    <=>x=20/24
    <=>x=5/6
    Vậy x=5/6

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222-9+11+12:2*14+14 = ? ( )

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